<html>

<head>
<title>GNU LESSER GENERAL PUBLIC LICENSE</title>
</head>

<body>

<h2>GNU LESSER GENERAL PUBLIC LICENSE</h2>

<p>Version 2.1, February 1999 </p>

<p>&nbsp;</p>

<pre>Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

[This is the first released version of the Lesser GPL.  It also counts
 as the successor of the GNU Library Public License, version 2, hence
 the version number 2.1.]
</pre>

<h2>Preamble</h2>

<p>The licenses for most software are designed to take away your freedom to share and
change it. By contrast, the GNU General Public Licenses are intended to guarantee your
freedom to share and change free software--to make sure the software is free for all its
users. </p>

<p>This license, the Lesser General Public License, applies to some specially designated
software packages--typically libraries--of the Free Software Foundation and other authors
who decide to use it. You can use it too, but we suggest you first think carefully about
whether this license or the ordinary General Public License is the better strategy to use
in any particular case, based on the explanations below. </p>

<p>When we speak of free software, we are referring to freedom of use, not price. Our
General Public Licenses are designed to make sure that you have the freedom to distribute
copies of free software (and charge for this service if you wish); that you receive source
code or can get it if you want it; that you can change the software and use pieces of it
in new free programs; and that you are informed that you can do these things. </p>

<p>To protect your rights, we need to make restrictions that forbid distributors to deny
you these rights or to ask you to surrender these rights. These restrictions translate to
certain responsibilities for you if you distribute copies of the library or if you modify
it. </p>

<p>For example, if you distribute copies of the library, whether gratis or for a fee, you
must give the recipients all the rights that we gave you. You must make sure that they,
too, receive or can get the source code. If you link other code with the library, you must
provide complete object files to the recipients, so that they can relink them with the
library after making changes to the library and recompiling it. And you must show them
these terms so they know their rights. </p>

<p>We protect your rights with a two-step method: (1) we copyright the library, and (2) we
offer you this license, which gives you legal permission to copy, distribute and/or modify
the library. </p>

<p>To protect each distributor, we want to make it very clear that there is no warranty
for the free library. Also, if the library is modified by someone else and passed on, the
recipients should know that what they have is not the original version, so that the
original author's reputation will not be affected by problems that might be introduced by
others. </p>

<p>Finally, software patents pose a constant threat to the existence of any free program.
We wish to make sure that a company cannot effectively restrict the users of a free
program by obtaining a restrictive license from a patent holder. Therefore, we insist that
any patent license obtained for a version of the library must be consistent with the full
freedom of use specified in this license. </p>

<p>Most GNU software, including some libraries, is covered by the ordinary GNU General
Public License. This license, the GNU Lesser General Public License, applies to certain
designated libraries, and is quite different from the ordinary General Public License. We
use this license for certain libraries in order to permit linking those libraries into
non-free programs. </p>

<p>When a program is linked with a library, whether statically or using a shared library,
the combination of the two is legally speaking a combined work, a derivative of the
original library. The ordinary General Public License therefore permits such linking only
if the entire combination fits its criteria of freedom. The Lesser General Public License
permits more lax criteria for linking other code with the library. </p>

<p>We call this license the &quot;Lesser&quot; General Public License because it does Less
to protect the user's freedom than the ordinary General Public License. It also provides
other free software developers Less of an advantage over competing non-free programs.
These disadvantages are the reason we use the ordinary General Public License for many
libraries. However, the Lesser license provides advantages in certain special
circumstances. </p>

<p>For example, on rare occasions, there may be a special need to encourage the widest
possible use of a certain library, so that it becomes a de-facto standard. To achieve
this, non-free programs must be allowed to use the library. A more frequent case is that a
free library does the same job as widely used non-free libraries. In this case, there is
little to gain by limiting the free library to free software only, so we use the Lesser
General Public License. </p>

<p>In other cases, permission to use a particular library in non-free programs enables a
greater number of people to use a large body of free software. For example, permission to
use the GNU C Library in non-free programs enables many more people to use the whole GNU
operating system, as well as its variant, the GNU/Linux operating system. </p>

<p>Although the Lesser General Public License is Less protective of the users' freedom, it
does ensure that the user of a program that is linked with the Library has the freedom and
the wherewithal to run that program using a modified version of the Library. </p>

<p>The precise terms and conditions for copying, distribution and modification follow. Pay
close attention to the difference between a &quot;work based on the library&quot; and a
&quot;work that uses the library&quot;. The former contains code derived from the library,
whereas the latter must be combined with the library in order to run. </p>

<p>&nbsp;</p>

<h2>TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</h2>

<p><strong>0.</strong> This License Agreement applies to any software library or other
program which contains a notice placed by the copyright holder or other authorized party
saying it may be distributed under the terms of this Lesser General Public License (also
called &quot;this License&quot;). Each licensee is addressed as &quot;you&quot;. </p>

<p>A &quot;library&quot; means a collection of software functions and/or data prepared so
as to be conveniently linked with application programs (which use some of those functions
and data) to form executables. </p>

<p>The &quot;Library&quot;, below, refers to any such software library or work which has
been distributed under these terms. A &quot;work based on the Library&quot; means either
the Library or any derivative work under copyright law: that is to say, a work containing
the Library or a portion of it, either verbatim or with modifications and/or translated
straightforwardly into another language. (Hereinafter, translation is included without
limitation in the term &quot;modification&quot;.) </p>

<p>&quot;Source code&quot; for a work means the preferred form of the work for making
modifications to it. For a library, complete source code means all the source code for all
modules it contains, plus any associated interface definition files, plus the scripts used
to control compilation and installation of the library. </p>

<p>Activities other than copying, distribution and modification are not covered by this
License; they are outside its scope. The act of running a program using the Library is not
restricted, and output from such a program is covered only if its contents constitute a
work based on the Library (independent of the use of the Library in a tool for writing
it). Whether that is true depends on what the Library does and what the program that uses
the Library does. </p>

<p><strong>1.</strong> You may copy and distribute verbatim copies of the Library's
complete source code as you receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice and disclaimer of
warranty; keep intact all the notices that refer to this License and to the absence of any
warranty; and distribute a copy of this License along with the Library. </p>

<p>You may charge a fee for the physical act of transferring a copy, and you may at your
option offer warranty protection in exchange for a fee. </p>

<p><strong>2.</strong> You may modify your copy or copies of the Library or any portion of
it, thus forming a work based on the Library, and copy and distribute such modifications
or work under the terms of Section 1 above, provided that you also meet all of these
conditions: </p>

<p>&nbsp; 

<ul>
  <li><strong>a)</strong> The modified work must itself be a software library. </li>
  <li><strong>b)</strong> You must cause the files modified to carry prominent notices stating
    that you changed the files and the date of any change. </li>
  <li><strong>c)</strong> You must cause the whole of the work to be licensed at no charge to
    all third parties under the terms of this License. </li>
  <li><strong>d)</strong> If a facility in the modified Library refers to a function or a
    table of data to be supplied by an application program that uses the facility, other than
    as an argument passed when the facility is invoked, then you must make a good faith effort
    to ensure that, in the event an application does not supply such function or table, the
    facility still operates, and performs whatever part of its purpose remains meaningful. <p>(For
    example, a function in a library to compute square roots has a purpose that is entirely
    well-defined independent of the application. Therefore, Subsection 2d requires that any
    application-supplied function or table used by this function must be optional: if the
    application does not supply it, the square root function must still compute square roots.)
    </p>
    <p>These requirements apply to the modified work as a whole. If identifiable sections of
    that work are not derived from the Library, and can be reasonably considered independent
    and separate works in themselves, then this License, and its terms, do not apply to those
    sections when you distribute them as separate works. But when you distribute the same
    sections as part of a whole which is a work based on the Library, the distribution of the
    whole must be on the terms of this License, whose permissions for other licensees extend
    to the entire whole, and thus to each and every part regardless of who wrote it. </p>
    <p>Thus, it is not the intent of this section to claim rights or contest your rights to
    work written entirely by you; rather, the intent is to exercise the right to control the
    distribution of derivative or collective works based on the Library. </p>
    <p>In addition, mere aggregation of another work not based on the Library with the Library
    (or with a work based on the Library) on a volume of a storage or distribution medium does
    not bring the other work under the scope of this License. </p>
  </li>
</ul>

<p><strong>3.</strong> You may opt to apply the terms of the ordinary GNU General Public
License instead of this License to a given copy of the Library. To do this, you must alter
all the notices that refer to this License, so that they refer to the ordinary GNU General
Public License, version 2, instead of to this License. (If a newer version than version 2
of the ordinary GNU General Public License has appeared, then you can specify that version
instead if you wish.) Do not make any other change in these notices. </p>

<p>Once this change is made in a given copy, it is irreversible for that copy, so the
ordinary GNU General Public License applies to all subsequent copies and derivative works
made from that copy. </p>

<p>This option is useful when you wish to copy part of the code of the Library into a
program that is not a library. </p>

<p><strong>4.</strong> You may copy and distribute the Library (or a portion or derivative
of it, under Section 2) in object code or executable form under the terms of Sections 1
and 2 above provided that you accompany it with the complete corresponding
machine-readable source code, which must be distributed under the terms of Sections 1 and
2 above on a medium customarily used for software interchange. </p>

<p>If distribution of object code is made by offering access to copy from a designated
place, then offering equivalent access to copy the source code from the same place
satisfies the requirement to distribute the source code, even though third parties are not
compelled to copy the source along with the object code. </p>

<p><strong>5.</strong> A program that contains no derivative of any portion of the
Library, but is designed to work with the Library by being compiled or linked with it, is
called a &quot;work that uses the Library&quot;. Such a work, in isolation, is not a
derivative work of the Library, and therefore falls outside the scope of this License. </p>

<p>However, linking a &quot;work that uses the Library&quot; with the Library creates an
executable that is a derivative of the Library (because it contains portions of the
Library), rather than a &quot;work that uses the library&quot;. The executable is
therefore covered by this License. Section 6 states terms for distribution of such
executables. </p>

<p>When a &quot;work that uses the Library&quot; uses material from a header file that is
part of the Library, the object code for the work may be a derivative work of the Library
even though the source code is not. Whether this is true is especially significant if the
work can be linked without the Library, or if the work is itself a library. The threshold
for this to be true is not precisely defined by law. </p>

<p>If such an object file uses only numerical parameters, data structure layouts and
accessors, and small macros and small inline functions (ten lines or less in length), then
the use of the object file is unrestricted, regardless of whether it is legally a
derivative work. (Executables containing this object code plus portions of the Library
will still fall under Section 6.) </p>

<p>Otherwise, if the work is a derivative of the Library, you may distribute the object
code for the work under the terms of Section 6. Any executables containing that work also
fall under Section 6, whether or not they are linked directly with the Library itself. </p>

<p><strong>6.</strong> As an exception to the Sections above, you may also combine or link
a &quot;work that uses the Library&quot; with the Library to produce a work containing
portions of the Library, and distribute that work under terms of your choice, provided
that the terms permit modification of the work for the customer's own use and reverse
engineering for debugging such modifications. </p>

<p>You must give prominent notice with each copy of the work that the Library is used in
it and that the Library and its use are covered by this License. You must supply a copy of
this License. If the work during execution displays copyright notices, you must include
the copyright notice for the Library among them, as well as a reference directing the user
to the copy of this License. Also, you must do one of these things: </p>

<p>&nbsp; 

<ul>
  <li><strong>a)</strong> Accompany the work with the complete corresponding machine-readable
    source code for the Library including whatever changes were used in the work (which must
    be distributed under Sections 1 and 2 above); and, if the work is an executable linked
    with the Library, with the complete machine-readable &quot;work that uses the
    Library&quot;, as object code and/or source code, so that the user can modify the Library
    and then relink to produce a modified executable containing the modified Library. (It is
    understood that the user who changes the contents of definitions files in the Library will
    not necessarily be able to recompile the application to use the modified definitions.) </li>
  <li><strong>b)</strong> Use a suitable shared library mechanism for linking with the
    Library. A suitable mechanism is one that (1) uses at run time a copy of the library
    already present on the user's computer system, rather than copying library functions into
    the executable, and (2) will operate properly with a modified version of the library, if
    the user installs one, as long as the modified version is interface-compatible with the
    version that the work was made with. </li>
  <li><strong>c)</strong> Accompany the work with a written offer, valid for at least three
    years, to give the same user the materials specified in Subsection 6a, above, for a charge
    no more than the cost of performing this distribution. </li>
  <li><strong>d)</strong> If distribution of the work is made by offering access to copy from
    a designated place, offer equivalent access to copy the above specified materials from the
    same place. </li>
  <li><strong>e)</strong> Verify that the user has already received a copy of these materials
    or that you have already sent this user a copy. </li>
</ul>

<p>For an executable, the required form of the &quot;work that uses the Library&quot; must
include any data and utility programs needed for reproducing the executable from it.
However, as a special exception, the materials to be distributed need not include anything
that is normally distributed (in either source or binary form) with the major components
(compiler, kernel, and so on) of the operating system on which the executable runs, unless
that component itself accompanies the executable. </p>

<p>It may happen that this requirement contradicts the license restrictions of other
proprietary libraries that do not normally accompany the operating system. Such a
contradiction means you cannot use both them and the Library together in an executable
that you distribute. </p>

<p><strong>7.</strong> You may place library facilities that are a work based on the
Library side-by-side in a single library together with other library facilities not
covered by this License, and distribute such a combined library, provided that the
separate distribution of the work based on the Library and of the other library facilities
is otherwise permitted, and provided that you do these two things: </p>

<p>&nbsp; 

<ul>
  <li><strong>a)</strong> Accompany the combined library with a copy of the same work based on
    the Library, uncombined with any other library facilities. This must be distributed under
    the terms of the Sections above. </li>
  <li><strong>b)</strong> Give prominent notice with the combined library of the fact that
    part of it is a work based on the Library, and explaining where to find the accompanying
    uncombined form of the same work. </li>
</ul>

<p><strong>8.</strong> You may not copy, modify, sublicense, link with, or distribute the
Library except as expressly provided under this License. Any attempt otherwise to copy,
modify, sublicense, link with, or distribute the Library is void, and will automatically
terminate your rights under this License. However, parties who have received copies, or
rights, from you under this License will not have their licenses terminated so long as
such parties remain in full compliance. </p>

<p><strong>9.</strong> You are not required to accept this License, since you have not
signed it. However, nothing else grants you permission to modify or distribute the Library
or its derivative works. These actions are prohibited by law if you do not accept this
License. Therefore, by modifying or distributing the Library (or any work based on the
Library), you indicate your acceptance of this License to do so, and all its terms and
conditions for copying, distributing or modifying the Library or works based on it. </p>

<p><strong>10.</strong> Each time you redistribute the Library (or any work based on the
Library), the recipient automatically receives a license from the original licensor to
copy, distribute, link with or modify the Library subject to these terms and conditions.
You may not impose any further restrictions on the recipients' exercise of the rights
granted herein. You are not responsible for enforcing compliance by third parties with
this License. </p>

<p><strong>11.</strong> If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues), conditions are
imposed on you (whether by court order, agreement or otherwise) that contradict the
conditions of this License, they do not excuse you from the conditions of this License. If
you cannot distribute so as to satisfy simultaneously your obligations under this License
and any other pertinent obligations, then as a consequence you may not distribute the
Library at all. For example, if a patent license would not permit royalty-free
redistribution of the Library by all those who receive copies directly or indirectly
through you, then the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Library. </p>

<p>If any portion of this section is held invalid or unenforceable under any particular
circumstance, the balance of the section is intended to apply, and the section as a whole
is intended to apply in other circumstances. </p>

<p>It is not the purpose of this section to induce you to infringe any patents or other
property right claims or to contest validity of any such claims; this section has the sole
purpose of protecting the integrity of the free software distribution system which is
implemented by public license practices. Many people have made generous contributions to
the wide range of software distributed through that system in reliance on consistent
application of that system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot impose that choice. </p>

<p>This section is intended to make thoroughly clear what is believed to be a consequence
of the rest of this License. </p>

<p><strong>12.</strong> If the distribution and/or use of the Library is restricted in
certain countries either by patents or by copyrighted interfaces, the original copyright
holder who places the Library under this License may add an explicit geographical
distribution limitation excluding those countries, so that distribution is permitted only
in or among countries not thus excluded. In such case, this License incorporates the
limitation as if written in the body of this License. </p>

<p><strong>13.</strong> The Free Software Foundation may publish revised and/or new
versions of the Lesser General Public License from time to time. Such new versions will be
similar in spirit to the present version, but may differ in detail to address new problems
or concerns. </p>

<p>Each version is given a distinguishing version number. If the Library specifies a
version number of this License which applies to it and &quot;any later version&quot;, you
have the option of following the terms and conditions either of that version or of any
later version published by the Free Software Foundation. If the Library does not specify a
license version number, you may choose any version ever published by the Free Software
Foundation. </p>

<p><strong>14.</strong> If you wish to incorporate parts of the Library into other free
programs whose distribution conditions are incompatible with these, write to the author to
ask for permission. For software which is copyrighted by the Free Software Foundation,
write to the Free Software Foundation; we sometimes make exceptions for this. Our decision
will be guided by the two goals of preserving the free status of all derivatives of our
free software and of promoting the sharing and reuse of software generally. </p>

<p><strong>NO WARRANTY</strong> </p>

<p><strong>15.</strong> BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE
STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE LIBRARY &quot;AS
IS&quot; WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE LIBRARY IS WITH YOU.
SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR
OR CORRECTION. </p>

<p><strong>16.</strong> IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE
THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL,
SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THE LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE
OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE LIBRARY TO OPERATE WITH
ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. </p>
</body>
</html>
